Lighting diffuser



FIG. 1 is a top perspective view of a lighting diffuser according to the present design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a front elevation view thereof; the rear, right side, and left side elevation views being identical to the front elevation view shown.

The evenly spaced broken lines in the drawings illustrate unclaimed features of the lighting diffuser and form no part of the claimed design. The dash-dot-dot-dash broken lines in the drawings represent borders of unclaimed portions of the lighting diffuser and form no part of the claimed design. The appearance of any portion of the lighting diffuser within the dash-dot-dot-dash broken lines forms no part of the claimed design. 

CLAIM The ornamental design for a lighting diffuser, as shown and described. 